Reversibility of imprinting.

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Abstract
24 isolated chicks, reared for 3 days with a hanging colored object, chose this object in a simultaneous choice test. Each S was then reared with an object of different color or shape and this became the preferred object after 3 or 6 days. The preference for the 2nd object was maintained when objects were absent for 3 days. Yellow and rectangular objects were less preferred than blue, green, and ball-shaped objects. Newly hatched Ss chose a ball in preference to a rectangular object. Color or shape preferences established during the critical period for imprinting can be reversed, although some stimuli may be intrinsically preferred. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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